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227
RESULTS

Media Type
227
texts
Topics & Subjects
58
Geology
28
Geology, Stratigraphic
25
Groundwater
20
Coal
16
Mines and mineral resources
13
Mineral industries
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Collection
227
American Libraries
227
University of Illinois Urbana-Champaign
Creator
12
reinertsen, david l
12
samson, irma
11
georef information system
10
frankie, wayne t
10
illinois state geological survey
8
larson, timothy h
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Language
227
English
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